Fuels And Combustion MCQs

Option A: Four

Option B: Five

Option C: Six

Option D: Two

Correct Answer: Four ✔

Option A: Bituminous coal

Option B: Coke

Option C: Semi-bituminous coal

Option D: Anthracite

Correct Answer: Coke ✔

Option A: Vitrain

Option B: Clarain

Option C: Durain

Option D: Fussain

Correct Answer: Vitrain ✔

Option A: Decreases the dew point

Option B: Increases the dew point

Option C: Reduces the combustion efficiency by limiting the permissible temperature reduction

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Decrease in its caking power & calorific value

Option B: Decrease in its carbon & hydrogen content

Option C: Increase in its oxygen content

Option D: All A., B. and A.

Correct Answer: D. All A., B. and A. ✔

Option A: May damage its walls due to abrupt excessive swelling of coal

Option B: Produces larger size coke

Option C: Increases the time of carbonisation

Option D: None of these

Correct Answer: May damage its walls due to abrupt excessive swelling of coal ✔

Option A: Provides better control of furnace temperature

Option B: Facilitates combustion with lower excess air

Option C: Provides higher thermal efficiency & flame temperature

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Its thorough mixing with air

Option B: Attainment of chemical equilibrium

Option C: Attainment of high temperature

Option D: None of these

Correct Answer: Its thorough mixing with air ✔

Option A: 70

Option B: 85

Option C: 105

Option D: 145

Correct Answer: 105 ✔

Option A: CO2

Option B: CH4

Option C: H2

Option D: NH3

Correct Answer: CH4 ✔

Option A: Calorific value increases

Option B: Caking properties diminish

Option C: Swelling during carbonisation becomes excessive

Option D: None of these

Correct Answer: Caking properties diminish ✔

Option A: Increase in gas pressure

Option B: Increase in temperature (i.e. preheating)

Option C: Use of pure oxygen for combustion instead of air

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Cyclone separator

Option B: Wet packed scrubber

Option C: Electrostatic precipitator

Option D: Washing with monoethanolamine

Correct Answer: Electrostatic precipitator ✔

Option A: Coal

Option B: Furnace oil

Option C: Natural gas

Option D: Naphtha

Correct Answer: Coal ✔

Option A: Fast & high

Option B: Slow & low

Option C: Slow & high

Option D: Fast & slow

Correct Answer: Fast & high ✔

Option A: N2

Option B: CO

Option C: CO2

Option D: H2

Correct Answer: N2 ✔

Option A: Caking

Option B: Pulverised

Option C: Non-caking

Option D: High ash

Correct Answer: Non-caking ✔

Option A: Moving

Option B: Fixed

Option C: Fluidised

Option D: Entrained

Correct Answer: Moving ✔

Option A: The ratio of its percentage of fixed carbon to that of volatile matter

Option B: Helpful in estimation of its rank

Option C: Both A. and B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. and B. ✔

Option A: Its pulverisation (as it requires more power)

Option B: Combustion of fire slacks on the grates

Option C: Handling (e.g. when emptying wagons)

Option D: None of these

Correct Answer: Its pulverisation (as it requires more power) ✔

Option A: Uranium

Option B: Plutonium

Option C: Radium

Option D: None of these

Correct Answer: Uranium ✔

Option A: 5000

Option B: 25,000

Option C: 10,000

Option D: 15,000

Correct Answer: 25,000 ✔

Option A: Calorific value

Option B: Caking power

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: Calorific value

Option B: Higher C/H ratio

Option C: Sulphur content

Option D: Difference in gross & net calorific value

Correct Answer: Higher C/H ratio ✔

Option A: KOH

Option B: Ammoniacal cuprous chloride

Option C: Pyrogallol solution

Option D: None of these

Correct Answer: None of these ✔

Option A: Nickel

Option B: Zinc oxide

Option C: Alumina

Option D: Thorium oxide

Correct Answer: Nickel ✔

Option A: 11

Option B: 2

Option C: 20

Option D: 38

Correct Answer: 11 ✔

Option A: Caking capacity

Option B: Volatile matter content

Option C: Fusion point of its ash

Option D: Inherent moisture content

Correct Answer: Caking capacity ✔

Option A: Increases

Option B: Decreases

Option C: Remain same

Option D: Either A. or B., depends on other factors

Correct Answer: Increases ✔

Option A: Decolourisation of sugar

Option B: Solvent recovery from air and gases

Option C: Absorption of gases and vapor

Option D: Electrode manufacture

Correct Answer: Electrode manufacture ✔

Option A: Reduced NOx formation in flue gas

Option B: Lower furnace operating temperature

Option C: High heat transfer rate

Option D: All A., B. & C.

Correct Answer: D. All A., B. & C. ✔

Option A: Minimise its corrosion

Option B: Avoid radiation heat loss

Option C: Make it look attractive

Option D: None of these

Correct Answer: Avoid radiation heat loss ✔

A. M40 > 78% and M10 < 10%
B. M40 > 4% and M10 10% and M10 98% and M10 < 2%

Correct Answer: M40 > 78% and M10 < 10% ✔

Option A: Non-caking coal

Option B: Caking coal

Option C: Coking coal

Option D: Pulverised coal

Correct Answer: Non-caking coal ✔

Option A: Supply of excess fuel

Option B: Supply of excess air

Option C: Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying

Option D: None of these

Correct Answer: C. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying
more air ✔

Option A: Higher methane content and thus higher calorific value

Option B: Higher carbon monoxide content

Option C: Lower carbon dioxide content

Option D: None of these

Correct Answer: Higher methane content and thus higher calorific value ✔

Option A: 0.1

Option B: 0.2

Option C: 0.5

Option D: 1.0

Correct Answer: 0.1 ✔

Option A: Iron blast furnace

Option B: Cupola in foundries

Option C: Sinter making

Option D: Domestic ovens

Correct Answer: Iron blast furnace ✔

Option A: 8

Option B: 14

Option C: 22

Option D: 52

Correct Answer: 22 ✔

Option A: Lignite

Option B: Bituminous

Option C: Semi-anthracite

Option D: Anthracite

Correct Answer: Anthracite ✔

Option A: Emissivity factor is higher

Option B: Sulphur content is lower

Option C: Flue gas has lower dew point thereby facilitating more waste heat recovery

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: Smoke

Option B: Temperature

Option C: Oxygen

Option D: Carbon monoxide

Correct Answer: Carbon monoxide ✔

Option A: Young

Option B: Mature

Option C: Both A & B

Option D: Neither A nor B

Correct Answer: Both A & B ✔

Option A: Increased fuel consumption

Option B: Incomplete combustion

Option C: Smoky flame

Option D: None of these

Correct Answer: Increased fuel consumption ✔

Option A: Reactivity

Option B: Porosity

Option C: Bulk density

Option D: Hardness & strength

Correct Answer: Hardness & strength ✔

Option A: Hydrogen

Option B: Carbon monoxide

Option C: Acetylene

Option D: Methane

Correct Answer: Acetylene ✔

Option A: Should have high porosity

Option B: Should be brittle

Option C: Must contain moderate quantities of ash, moisture, sulphur and volatile matters

Option D: Should have low fusion point of its ash

Correct Answer: Should have high porosity ✔

Option A: Only CO

Option B: Both CO and CO2

Option C: Both CO and O2

Option D: All CO, CO2, and O2

Correct Answer: All CO, CO2, and O2 ✔

Option A: Carbon monoxide

Option B: Hydrocarbons

Option C: Hydrogen

Option D: Oxygen

Correct Answer: Hydrocarbons ✔

Option A: CO (upto 65%) & CO2

Option B: CO2 & H2

Option C: CO & O2

Option D: CO2 & O2

Correct Answer: CO (upto 65%) & CO2 ✔

Option A: Produce weak coke

Option B: Produce strong coke

Option C: May damage the coke oven walls during carbonisation

Option D: Both B. and C.

Correct Answer: D. Both B. and C. ✔

Option A: Non-luminous

Option B: Luminous

Option C: Yellow

Option D: Unburnt gases

Correct Answer: Non-luminous ✔

Option A: 27.6

Option B: 23

Option C: 47.3

Option D: 42.9

Correct Answer: 23 ✔

Option A: 200 °F

Option B: 200 °C

Option C: 200 °K

Option D: 200 °R

Correct Answer: 200 °F ✔

Option A: H2

Option B: C2H2

Option C: CO

Option D: C2H6

Correct Answer: CO ✔

Option A: Cracking

Option B: Reforming

Option C: Gasification

Option D: Partial oxidation

Correct Answer: Partial oxidation ✔

Option A: Humic coals

Option B: Liptobiolites

Option C: Sapropelic coals

Option D: None of these

Correct Answer: Sapropelic coals ✔

Option A: CO2

Option B: CH4

Option C: H2

Option D: CO

Correct Answer: CH4 ✔

Option A: 5

Option B: 21

Option C: 40

Option D: 48

Correct Answer: 21 ✔

Option A: 2.5

Option B: 7.5

Option C: 10.5

Option D: 14.5

Correct Answer: 2.5 ✔

Option A: Gasoline

Option B: Diesel

Option C: Fuel oil

Option D: Kerosene

Correct Answer: Kerosene ✔

Option A: Ensure its complete combustion

Option B: Facilitate easy ash removal

Option C: Enhance its calorific value

Option D: Provide trouble free operation

Correct Answer: Ensure its complete combustion ✔

Option A: Reactivity with O2

Option B: Abradability

Option C: Phosphorus content

Option D: Volatile matter content

Correct Answer: Reactivity with O2 ✔

Option A: Give less yield of tar and gas on carbonisation

Option B: Burn with a small non-smoky flame

Option C: Have a very high calorific value

Option D: None of these

Correct Answer: None of these ✔

Option A: Auto catalytic

Option B: Exothermic

Option C: Endothermic

Option D: None of these

Correct Answer: Exothermic ✔

Option A: More

Option B: Less

Option C: Same

Option D: Data insufficient; can’t be predicted

Correct Answer: Same ✔

Option A: Sulphur content

Option B: Calorific value

Option C: Both A. & B.

Option D: Neither A. nor B.

Correct Answer: C. Both A. & B. ✔

Option A: N2

Option B: H2

Option C: CH4

Option D: CO2

Correct Answer: H2 ✔

Option A: Lower than

Option B: Higher than

Option C: Same as

Option D: Not related to

Correct Answer: Lower than ✔

Option A: Excessive power requirement of air blower

Option B: Enhanced sensible heat loss in the flue gas

Option C: Intermittent and uncontrolled combustion of the fuel

Option D: High exit flue gas temperature from the furnace

Correct Answer: Enhanced sensible heat loss in the flue gas ✔

Option A: Inside mixing/premix type

Option B: Outside mixing/diffusion flame/nozzle mix type

Option C: Rotary cup

Option D: Submerged combustion

Correct Answer: Inside mixing/premix type ✔

Option A: 100

Option B: 500

Option C: 1000

Option D: 1500

Correct Answer: 500 ✔

Option A: Coke breeze containing 25% ash and 2% volatile matter

Option B: Anthracite containing 10% volatile matter and 8% ash

Option C: Bituminous coal containing 20% ash and 25% volatile matter

Option D: Semi-bituminous coal containing 25% ash and 20% volatile matter

Correct Answer: Coke breeze containing 25% ash and 2% volatile matter ✔

Option A: 850

Option B: 1800

Option C: 4200

Option D: 6500

Correct Answer: 850 ✔

Option A: Is present upto 1-2%

Option B: Comes from protein in parent vegetable matter

Option C: Is recovered as ammonia during its carbonisation

Option D: All A., B. and C.

Correct Answer: D. All A., B. and C. ✔

Option A: CO

Option B: CO2

Option C: H2

Option D: CH4

Correct Answer: CH4 ✔

Option A: Shallow and small piles

Option B: Fine sizes without the presence of any lump

Option C: Closed space without any ventilation facility

Option D: Large heaps with small surface to volume ratio

Correct Answer: Shallow and small piles ✔

Option A: Caking index

Option B: Mineral matter content

Option C: Ash content

Option D: Both B. and C.

Correct Answer: Mineral matter content ✔

Option A: Cuprous chloride

Option B: Potassium hydroxide

Option C: Alkaline pyrogallol solution

Option D: None of these

Correct Answer: Cuprous chloride ✔

Option A: Transportation of coal

Option B: Drying of coal

Option C: Combustion of coal by supplying it around the burner

Option D: Preheating the primary air

Correct Answer: Combustion of coal by supplying it around the burner ✔

Option A: Proximate analysis

Option B: Ultimate analysis

Option C: Caking index

Option D: Calorific value

Correct Answer: Ultimate analysis ✔

Option A: C + H2O ↔ CO + H2

Option B: C + 2H2O ↔ CO2 + 2H2

Option C: CO + H2O ↔ CO2 + H2

Option D: None of these

Correct Answer: CO + H2O ↔ CO2 + H2 ✔

Option A: H2

Option B: CH4

Option C: CO2

Option D: N2

Correct Answer: CH4 ✔

Option A: Abradability

Option B: Reactivity

Option C: Agglutinating (binding) properties

Option D: Porosity

Correct Answer: Agglutinating (binding) properties ✔